run402-mcp/core/dist/wallet.js

MCP server for Run402 — full-stack backend infrastructure for AI agents: Postgres, auth, storage, serverless functions and atomic deploys. Paid with x402/MPP. Includes $0.03 image generation.

import { readFileSync, writeFileSync, mkdirSync, existsSync, chmodSync, renameSync, statSync } from "node:fs";
import { dirname, join } from "node:path";
import { randomBytes } from "node:crypto";
import { getWalletPath } from "./config.js";
// 0x-prefixed 40-hex EVM address.
const ADDRESS_RE = /^0x[a-fA-F0-9]{40}$/;
// 0x-prefixed 64-hex secp256k1 private key (32 bytes).
const PRIVATE_KEY_RE = /^0x[a-fA-F0-9]{64}$/;
/**
 * Load the agent wallet from disk.
 *
 * Returns `null` for the two "no local wallet configured" cases:
 *   - the file does not exist
 *   - the file exists but is not parseable JSON (preserve existing UX —
 *     consumers print "no_wallet" and tell the user to run init)
 *
 * Throws a structured `Error` when the file parses as JSON but the
 * shape is wrong (missing/wrong-type/wrong-length fields). Without this guard
 * downstream callers crash with raw stack traces:
 *   - `cli/lib/status.mjs` reaches for `wallet.address.toLowerCase()`
 *     and crashes with `TypeError: Cannot read properties of undefined`.
 *   - `core/src/wallet-auth.ts` passes a malformed `privateKey` to
 *     `@noble/curves` which throws "expected 32 bytes, got N".
 *
 * The CLI's `cli/lib/config.mjs:readWallet()` wrapper and the Node SDK's
 * `readLocalWallet()` (`sdk/src/node/wallets.ts`) translate the throw into
 * their own structured envelopes (`code: BAD_WALLET_FILE`).
 */
/**
 * If a wallet file is readable by group or other (any of the low 0o077
 * bits set), tighten it to 0600 and warn once on stderr. This self-heals the
 * historical case where a legacy world-readable `wallet.json` (mode 0644) was
 * migrated to `wallet.json` via a mode-preserving rename, leaving the
 * private key exposed on a shared machine. Best-effort: POSIX-only and silent
 * on platforms without meaningful Unix modes (e.g. Windows).
 */
function selfHealPermissions(p) {
    if (process.platform === "win32")
        return;
    try {
        const mode = statSync(p).mode & 0o777;
        if ((mode & 0o077) !== 0) {
            chmodSync(p, 0o600);
            process.stderr.write(`warning: tightened permissions on ${p} from ${mode.toString(8)} to 600 (was readable by other users).\n`);
        }
    }
    catch {
        // Best-effort; never block a read on a chmod/stat failure.
    }
}
export function readWallet(path) {
    const p = path ?? getWalletPath();
    if (!existsSync(p))
        return null;
    selfHealPermissions(p);
    let raw;
    try {
        raw = readFileSync(p, "utf-8");
    }
    catch {
        return null;
    }
    let parsed;
    try {
        parsed = JSON.parse(raw);
    }
    catch {
        // Preserve historical UX — completely unparseable input reads as "no
        // wallet configured" rather than as an error. Consumers already handle
        // null with a friendly "run 'run402 init'" message.
        return null;
    }
    if (parsed === null || typeof parsed !== "object" || Array.isArray(parsed)) {
        throw new Error(`wallet.json must contain a JSON object (got ${Array.isArray(parsed) ? "array" : parsed === null ? "null" : typeof parsed}). Back up the file and run 'run402 init' to recreate it.`);
    }
    const data = parsed;
    if (typeof data.address !== "string" || !ADDRESS_RE.test(data.address)) {
        throw new Error("wallet.json missing valid 'address' (expected 0x-prefixed 40-hex string). " +
            "Back up the file and run 'run402 init' to recreate it.");
    }
    if (typeof data.privateKey !== "string" || !PRIVATE_KEY_RE.test(data.privateKey)) {
        throw new Error("wallet.json missing valid 'privateKey' (expected 0x-prefixed 64-hex string). " +
            "Back up the file and run 'run402 init' to recreate it.");
    }
    return data;
}
export function saveWallet(data, path) {
    const p = path ?? getWalletPath();
    const dir = dirname(p);
    mkdirSync(dir, { recursive: true });
    const tmp = join(dir, `.wallet.${randomBytes(4).toString("hex")}.tmp`);
    writeFileSync(tmp, JSON.stringify(data, null, 2), { mode: 0o600 });
    renameSync(tmp, p);
    chmodSync(p, 0o600);
}
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